Here is a calculator to give you an idea of various costs based on location and type of care. Once you have your number you can offset by any after-tax pension, annuity, or ss. That amount is what would need to be withdrawn from savings (plus taxes) or financed.
Long-Term Care Calculator - Compare Costs of Nursing Homes, Assisted L... - AARP
Long-Term Care Calculator - Compare Costs of Nursing Homes, Assisted L... - AARP